Table 1 Participant Characteristics (Mean±SD)

From: Residual Effects of THC via Novel Measures of Brain Perfusion and Metabolism in a Large Group of Chronic Cannabis Users

 

Nonusers

Users

P -value

N

101

74

Age

30.3±10.3

31.3±7.9

0.45

Gender (M/F)

50/51

46/28

0.10

Full IQ

109.7±13.8

106.7±12.0

0.14

Duration of use (years)

10.6±7.3

No. of lifetime occurrence of cannabis use

14 173.8±10 866.0

Baseline THC/Cr

6.0±6.5

3-day abstinent THC/Cr (at time of scan)

1.9±1.4

No. of hours since last cannabis use

75.8±4.7

Number of participants per scan: N (M/F)

 PC MRI

98 (49/49)

67 (40/27)

 

 TRUST MRI

93 (47/46)

66 (39/27)

 

 pCASL MRI

94 (47/47)

64 (40/24)

 
  1. Abbreviations: M/F, male/female; IQ, Intelligence Quotient via Wechsler Abbreviated Scale of Intelligence as a measure of general intellect (Wechsler, 1999); THC, Δ9-tetrahydrocannabinol; Cr, creatinine; PC MRI, phase contrast MRI to measure global cerebral blood flow; TRUST MRI, T2-relaxation-under-spin-tagging MRI to measure global venous oxygenation; pCASL MRI, pseudo-continuous arterial spin labeling MRI to measure regional cerebral blood flow.